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Q. No.Consider the given two statements:
| Assertion (A): | Repetitive satellite DNA sequences are very useful identification tools in forensic applications. |
| Reason (R): | These sequences normally do not code for any proteins, but they form a large portion of human genome. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: DNA Fingerprinting |
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When compared to DNA, in RNA:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | every nucleotide residue has an additional –OH group present at 3'-position in the ribose. |
| II: | 5-methyl uracil is found instead of thymine. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: DNA vs RNA as Genetic Material |
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Identify the correct statements regarding the tRNA molecule:
1. Only a, b and c
2. Only a, c and d
3. Only b, c and d
4. a, b, c, and d
| a. | tRNA has an anticodon loop that has bases complementary to the code. |
| b. | tRNA has an amino acid acceptor end at the 5’ end to which it binds to amino acids. |
| c. | tRNAs are specific for each amino acid. |
| d. | There are no tRNAs for stop codons. |
2. Only a, c and d
3. Only b, c and d
4. a, b, c, and d
Subtopic: Transcription:II |
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Consider the given two statements:
| Assertion (A): | DNA fingerprinting is the basis of paternity testing, in case of disputes. |
| Reason (R): | DNA from every tissue (such as blood, hair-follicle, skin, bone, saliva, sperm etc.), from an individual show the same degree of polymorphism. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: DNA Fingerprinting |
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‘‘It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material’’ (Watson and Crick, 1953). What will be true regarding he statement quoted?
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | The ‘specific pairing’ refers to complementary base pairing. |
| II: | The ‘possible copying mechanism’ refers to conservative mechanism of DNA replication. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: DNA Replication |
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Subtopic: Genetic Code |
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Which of the following will directly support the conclusion derived by Oswald Avery, Colin MacLeod and Maclyn McCarty that DNA caused the bacterial transformation in Griffith’s experiment?
| I: | Protein-digesting enzymes (proteases) and RNA-digesting enzymes (RNases) did not affect transformation |
| II: | Digestion with DNase inhibited transformation. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Search for Genetic Material |
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Consider the given two statements:
| Assertion (A): | In the first phase of translation itself, amino acids are activated in the presence of ATP. |
| Reason (R): | If two such charged tRNAs are brought close enough, the formation of peptide bond between them would be favoured energetically. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A) |
Subtopic: Translation |
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| Assertion (A): | DNA has two chains having antiparallel polarity. |
| Reason (R): | In one chain of DNA at one end has a free phosphate moiety 5' end of ribose sugar and at other end the ribose has a free 3' OH group. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A) |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: DNA Double Helix |
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| Assertion (A): | The newly formed mRNA has the same sequence as the coding stand of transcriptional unit with uracil present in place of thymine. |
| Reason (R): | The rule of complementarily guides the formation of DNA and RNA. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: DNA Double Helix |
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